Do you have a solution for sensing distance in the range of 0-10 cms with a precision of +- 1 mm, but able to work in a plasma cutting machine?
The porpouse is to compensate sheet deflections due to the heat that plasma generates (near 400 Celsius) on the surface being cutted, but in a very noisy electromagnetic environment, as the plasma flame is an electric arc modified with a high pressure air flow.
I've tryed with inductor sensors and they fail when cutting thick metal sheets. I suppose that capacitive fails too. I've not tryed with ultrasonic, but it is possible that the plasma generate too some noise of this kind.
So, if you have a probed solution on this, I'll be happy to know about it.